©2018 by The Mansion 1857



A Hidden Gem

The Mansion is an upscale dining establishment specializing in seafood, steaks, and pasta dishes with creative signature recipes regularly being featured on our menu. 


Residing in a stately Italianate Manor in O'Fallon, Illinois, The Mansion has been built upon years of rich, intriguing history dating back to 1857, when it was built by A.J. Wastfield. The Mansion received a St. Clair County Landmark Award in 1963 from the St. Clair County Historical Society.

The Mansion is currently owned by Kathy Cox and Jerry Conway, who make it their mission for you to enjoy your visit. Our executive chef and co-owner of The Mansion, Jerry Conway, has worked at many fine dining establishments in his 25 years in the industry. Most notably, Chef Conway owned and operated The Cypress Room in Crystal River Florida and was an executive chef at Disney World where he was in charge of Epcot, The Magic Kingdom, The Royal Floridian and Disney's annual Wine and Cheese Festival. 

Please stop by and see what The Mansion has to offer! We are very proud to be the owners of The Mansion and take great pride in keeping the history behind it alive. If you are interested in a short tour of The Mansion after your meal, please ask your server.